Magnetic reluctance coupling having two rotors

A coupling arrangement comprising:

• a hollow-cylindrical stator including one or more magnets that are arranged around a circumference of the stator;
• a first rotor that is mounted inside the stator and is configured to rotate within the stator, the first rotor being fixed to the first shaft and configured to rotate with the first shaft, the first rotor including a plurality of ferromagnetic first portions that are arranged around a circumference of the first rotor and are separated from one another;
• and
• a second rotor that is mounted inside the first rotor and is configured to rotate within the first rotor, the second rotor being fixed to the second shaft and configured to rotate with the second shaft, the second rotor including a plurality of ferromagnetic second portions that are arranged around a circumference of the second rotor;
• and
• a control device configured to activate a coupling-engaging state in which a first magnetic field in the first and second rotors is directed in a first direction and, immediately after ending the coupling-engaging state by current pulses, a second magnetic field in the first and second rotors is formed in a second direction opposite to the first direction to demagnetize the first and second rotors;
• wherein each of the ferromagnetic first portions of the first rotor is formed as a bar having three subportions, a first subportion of each bar comprising ferromagnetic material arranged along an inner circumference of one of the two coaxial ferromagnetic rings, a second subportion of each bar comprising ferromagnetic material arranged along an inner circumference of the other one of the two ferromagnetic rings, and a third subportion of each bar comprising a non-magnetic material arranged axially between the first subportion and the second subportion.